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<p>Formed coke plays a vital role as a raw material in blast furnace smelting, with its mechanical strength directly influencing smelting efficiency and cost. The binder emerges as a crucial factor in enhancing its mechanical strength. In this study, a novel composite binder was prepared from oil sludge (OS) and alkali-activated peanut shells (APS) and was used to produce formed coke through pyrolysis in cold press molding of low-rank coal (LRC). The effects of pyrolysis temperature on the properties and mechanical strength of formed coke were investigated. The results showed that pyrolysis at 900&#xa0;°C resulted in optimal mechanical properties and yield balance, and it is suitable for blast furnace applications. At this temperature, the surface density of formed coke increased, the carbon microcrystals grew larger, achieving a maximum condensation degree (DOC) of aromatic rings of 2.7883, while the degree of maturity (C) reached its minimum at 0.3557. The presence of ether group C–O bonds, carbonyl C = O bonds, and inorganic oxygen in formed coke inhibited its mechanical strength improvement, while hydrocarbon C–C/C–H bonds and phenolic C–O bonds assisted in enhancing mechanical strength.</p>

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Enhancing mechanical strength of formed coke using a composite binder prepared by oil sludge and peanut shell

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Changcong Li,
  • Yuanqing Shi,
  • Tiantian Liu,
  • Lei Wu,
  • Chong Zou,
  • Ruiyu Zhu,
  • Jun Zhou

摘要

Formed coke plays a vital role as a raw material in blast furnace smelting, with its mechanical strength directly influencing smelting efficiency and cost. The binder emerges as a crucial factor in enhancing its mechanical strength. In this study, a novel composite binder was prepared from oil sludge (OS) and alkali-activated peanut shells (APS) and was used to produce formed coke through pyrolysis in cold press molding of low-rank coal (LRC). The effects of pyrolysis temperature on the properties and mechanical strength of formed coke were investigated. The results showed that pyrolysis at 900 °C resulted in optimal mechanical properties and yield balance, and it is suitable for blast furnace applications. At this temperature, the surface density of formed coke increased, the carbon microcrystals grew larger, achieving a maximum condensation degree (DOC) of aromatic rings of 2.7883, while the degree of maturity (C) reached its minimum at 0.3557. The presence of ether group C–O bonds, carbonyl C = O bonds, and inorganic oxygen in formed coke inhibited its mechanical strength improvement, while hydrocarbon C–C/C–H bonds and phenolic C–O bonds assisted in enhancing mechanical strength.